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Sorting multiple keys with Unix sort
I have potentially large files that need to be sorted by 1-n keys. Some of these keys might be numeric and some of them might not be. This is a fixed-width columnar file so there are no delimiters.
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Select unique or distinct values from a list in UNIX shell script
I have a ksh script that returns a long list of values, newline separated, and I want to see only the unique/distinct values. It is possible to do this?
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How can I convert a DateTime to the number of seconds since 1970?
I'm trying to convert a C# DateTime variable to Unix time, ie, the number of seconds since Jan 1st, 1970. It looks like a DateTime is actually implemented as the number of 'ticks' since Jan 1st, 0001.
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What characters are forbidden in Windows and Linux directory names?
...e question, first.
The forbidden printable ASCII characters are:
Linux/Unix:
/ (forward slash)
Windows:
< (less than)
> (greater than)
: (colon - sometimes works, but is actually NTFS Alternate Data Streams)
" (double quote)
/ (forward slash)
\ (backslash)
| (vertical bar or pipe)
? (qu...
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Balsamiq Mockup
Balsamiq Mockups是一款快速原...
PHP & mySQL: Year 2038 Bug: What is it? How to solve it?
...t exactly is the Year 2038 problem?
"The year 2038 problem (also known as Unix Millennium Bug, Y2K38 by analogy to the Y2K problem) may cause some computer software to fail before or in the year 2038. The problem affects all software and systems that store system time as a signed 32-bit integer, an...
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
...s.
If I'm correct exit codes used to be just positive numbers (I mean in UNIX) and according to range:
1-127 are user defined codes (so generated by calling exit(n))
128-255 are codes generated by termination due to different unix signals like SIGSEGV or SIGTERM
But I don't think you should ca...
Ignoring time zones altogether in Rails and PostgreSQL
...01 00:00:00 UTC.
Postgres also has built-in knowledge of the commonly used UNIX time counting seconds from the UNIX epoch, 1970-01-01 00:00:00 UTC, and uses that in functions to_timestamp(double precision) or EXTRACT(EPOCH FROM timestamptz).
The source code:
* Timestamps, as well as the h/m/s field...
sqlite database default time value 'now'
...e. You can save space by just using an INTEGER(4) column, and storing the unix time via "INSERT INTO test (t) values (strftime("%s", CURRENT_TIME));"
– mckoss
Feb 5 '12 at 8:17
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What generates the “text file busy” message in Unix?
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I think the fact that unix assumes files are "text files" is ilogical, in my case it was a binary file which prompted this error.
– Felipe Valdes
Dec 8 '17 at 1:43
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